- the angle formed by two radii of a circle that are drawn to the extremities of an arc equal to one quarter of the circle; the angle formed by two perpendicular lines that intersect; an angle of 90°.
Origin of right angle
Middle English word dating back to 1350–1400
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for right angle
The only one present who was seated like a man, legs crossed at right-angle, was Whoopi Goldberg.Obama's Televised Turn-Off
July 29, 2010
In 1933, Ben Shahn loaned Walker Evans a right-angle viewfinder, which he took on assignment to Vicksburg, Mississippi.Furtive Photography
May 27, 2010
Obtuse, an angle having a wider opening than a right-angle or "perpendicular."Stained Glass Work
C. W. Whall
At the epicentre, the angle of emergence is a right-angle; at a great distance from the epicentre, it is nearly zero.A Study of Recent Earthquakes
Its bole, five feet of stalwart diameter, rose straight and tapering to the first right-angle limbs, each in itself almost a tree.The Roof Tree
Charles Neville Buck
At length he rose and climbed on, presently turning at a right-angle to bisect the strip to its boundary before he paused to rest.The Valiants of Virginia
Hallie Erminie Rives
The toe is never pointed in line with the leg, but held at a right-angle to it, as in the standing position.The Morris Book
Cecil J. Sharp
- the angle between two radii of a circle that cut off on the circumference an arc equal in length to one quarter of the circumference; an angle of 90° or π/2 radians
- at right angles perpendicular or perpendicularly
- An angle having a measure of 90°.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.